• You couldn't do it without some modifications I'm afraid - as @allObjects says there isn't the hardware in the chip to handle wireless charging.

    I wouldn't suggest it I'm afraid - there are a few things you'd need to look out for:

    • LI2032 batteries can be at 4.2v when being charged, but Puck.js maxes out at 3.6v - so you'd need a voltage regulator (or a diode to drop the voltage).
    • I'm not sure how the existing NFC coil would cope with the power being sent to the separate coil - it'd definitely pick some of it up, and it could damage the nRF52 module
    • Physically you might have trouble fitting the charger board into the existing casing

    You could potentially cut the NFC tracks that lead to the nRF52 module, then add a full bridge rectifier to the existing coil - along with a diode to drop the voltage from the battery - but it's turning into a pretty serious modification.

    I should have a small Bluetooth LE board available soon (rather than the cased Puck.js), and it'd probably make more sense to try something with that instead?

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